While typing this post in Safari with VodooMonitor running and no other background task running, I see the CPU stepping up all the way to the 2500MHz and down every 2 or 3 secs. CPU usage in activity monitor shows less than 15% usage total for all tasks.

I have battery which lasts about 4 hours in windows 7 for browsing and I had Mac up for about an hour and battery is almost 50% empty.